Suction-roll.



G. H. ATKINS.

SUCTION ROLL. APPLICATION FILED mumo, m2.

1,120,432. Patented Dec. 8,1914

PVITNESSES: L VVENTOR,

C kdrles EJ212325 v v BY ATTORNEY.

CHARLES H. ATKINS, 0F SPRINGFIELD, MASSACHUSETTS.

SUCTION-ROLL.

Specification of Letters Patent.

Patented Dec. 8,1914.

Application filed March 30, 1912. Serial No. 687,430.

To all whom, it m ay concern.

Be it known that 1, CHARLES H. Armxs, a citizen of the United States ofAmerica, residing at Springfield, in the county of Hampden and State ofMassachusetts, have invented new and useful Improvements inSuction-Rolls, of which the following is a specification.

This invention relates to revolving suction rolls for paper machines andis related to my co-pending application filed June 24th, 1912, underSerial No. 705,358. It isespecially adapted for use in paper makingmachines, but can be used in other relations.

The object of this invention is to provide an efiicient means ofextracting water from pulp in the manufacture of paper.

Other objects of the invention will appear in the detailed descriptionand annexed claims.

In the drawings forming part of this application,Figure 1 is alongitudinal, sectional view of the suction roll. Fig. 2 is a crosssectional View thereof. Fig. 3 is a section taken on the line 33, ofFig. 2.

Referring to Fig. 1, a central pipe 9 has mounted thereon, for rotation,the hollow and perforated cylinder 9 which is supported on a suction boxA that has bearings at each end of the pipe q. This apparatus may beused in a Fourdrinier cylinder, or other paper making machine. When soused the wire or felts, carrying the paper which is to be dried, are ledto the rotating cylinder 9 at a point where the wooden block .9 pressesagainst the inner face of the cylinder 9 and the wire or felts rotatewith said cylinder for an are equal to the arc of the block 8. Thisblock is supported on a casting t,the latter being supported by :1diaphragm '0 which is,-in turn, supported by the casting '10 which ismounted on the pipe 5/. In the casting w is a standard a: with anadjustable stop thereon against which a spring y rests. This springpresses against a cross-piece 2 of the casting t and forces theblocksthereby against the inner face of the cylinder 9. The casting 'whas one or more communicating passages a between the space surrounded bythe casting to, diaphragm v, casting 2., and wooden block 8 with thepipe 1, as shown in the drawings. The pipe 1 is connected with anysuitable form of suction apparatus, in order to obtain a vacuum in thechamber surrounded as above stated.

There are. several of these standards .22 with spr ngs g acting againstthe cross-pieces 2, as indicated in Fig. 1. \Vhen the wire or ieltsrotate with the cylinder 9 through the are above stated, water isabstracted from the paper through the perforations in the cylinder 9'and in the block 8. This water passes along with the accompanying airdown through the passages a to the pipe 9, and from thence to anysuitable point.

In apparatus of this description, it is most difiicult to obtain theproper pressure of the block 8 against the inner face of the rotatingcylinder 9, and where this proper pressure is not obtained, then thevacuum is destroyed to a certain extent and the apparatus renderedineifectual, for the amount of water drawn from the paper passing overthe cylinder will vary, and such variation is most objectionable. Inorder to obtain the proper pressure of this block 8, a balancing effectis obtained as follows: The 82(- terior area between the supportingpoints of the diaphragm will be subjected to atmospheric pressure, as isclear from Fig. 9.. This area may be varied as desired, and thereforethe pressure may be varied within certain limits. By designing thesprings 3 of the proper strength, and by regulating the stops againstwhich the springs 3 rest, as they are mounted on the standards .r, thepressure of the block 8, against the inner face of the cylinder 9upwardly, may be positively determined. Now, by balancing the pressuredownwardly, due to the atmospheric pressure against the diaphragm area,and the pressure upwardly due to the spring, the desired pressure of theblock .9 against the face of the cylinder 9 is obtained to a nicedegree, and in addition a great ad vantage is present because of thefact that there is no considerable pressure acting in any one directionwhich tends to distort the parts and throw any adjustment out of order.As shown and described, the pressures are clearly balanced and thereforeeach one may be made to compensate for the other and-only that amount ofpressure which is absolutely necessary to the efficiency of theapparatus needs to be used. In many other machines of this class it hasbeen necessary to overcome a great degree of unnecessary pressure, duetothe difference between the pressure in the suction chamber and theatmospheric pressure.

IVhat I claim, is

1. In a suction roll, a perforated cylinder mounted to revolve, meansfor supporting said cylinder, a suction box having communication withthe perforations in the cylinder, and means for yiel dingly forcing oneside of the suction box against the face of the cylinder, and meansother than the weight of said box tending to keep the same side of thebox away from the face of the cylinder whenever a partial vacuum isobtained in the box.

2. In a suction roll, a perforated cylinder mounted to revolve, asuction box therein having communication with the perforations in thecylinder, yielding means to force one side of the suction box againsttheinner face of the cylinder for frictional contact therewith, said sidebeing yieldingly sup-' ported with means tending .to force the same'away from frictional contact whenever a the other side subject to thepressure in the suction box.

4:. In a device of the class described, a

perforated suction roll, a' centrally mounted pipe therein, a suctionbox supported by and communicating with said pipe and the per forationsin the cylinder, yielding means to force one side of the box against theinner face of the cylinders, and yielding means to support that side ofthe box with one surface of said yielding means subject to at mosphericpressure, and the other side to the pressure in the suction box.

5. In a device of the class described, a perforated suction roll mountedto revolve, a suction box therein having an arc-shaped perforated side,yielding meansto force said perforated side against the, inner face ofthe roll, a suction pipe in said cylinder supporting said box, said boxhaving means subject to atmospheric pressure on one side tending toforce its perforated side away from the inner face of the roll, saidlast named means on its opposite side being subject to the pressure inthe box to allow the atmospheric pressure to act.

CHARLES H. ATKINS.

Witnesses FRANKLIN G. NEAL. HARRY W. BOWEN.

